Well, the first line of code, I'll fix the purple next time around so it's more legible.

第一行代码，我用紫色标记,这样增加了可读性。

哈佛公开课 - 计算机科学课程节选

- Well -- and I'll fix this blue next time -- I'm first telling the compiler I need access to the standard io library because printf is declared there.

哦！--下次我把这个字体颜色改成蓝色的-,我先告诉编译器--我需要使用,标准输入输出库,因为printf在那个库里面申明的。

哈佛公开课 - 计算机科学课程节选